RA8000 and ESA12000 Storage Subsystems
3–4
387404–001
EK–SMCPR–UG. A01
Table 3–3 Temperature Set Point Rules – EMU Firmware Vers. 1.2 and 1.3
1. Enter all temperatures in degrees Celsius (°C). Do not use fractions, decimals, or
degrees Fahrenheit (°F).
2. The EMU set point (sensor_3) temperature must be a minimum of 2°C (4°F)
greater than the highest expected ambient (intake) temperature.
3. The backplane set points (sensor_1 and sensor_2) must be the same
temperature and a minimum of 12
°
C (22
°
F) greater than the highest expected
ambient temperature. This requires a minimum setting of 10
°
C (18
°
F) greater
than the EMU set point.
4. EMU firmware versions 1.0 or 1.1
cannot use the
set emu
sensor_n_setpoint=default
command. Instead, the following command is
required:
set emu sensor_n_setpoint=nn
((where nn is the desired temperature in
°
C).
3.1.3 Setting the Blower Speed Control
The UltraSCSI enclosure blowers normally operate at low speed and provide sufficient air
flow to cool the enclosure components and ensure proper operation. You can use the CLI
FANSPEED command to change the operating speed of the blowers.
•
When you set FANSPEED = HIGH all blowers in all enclosures operate at high
speed
•
When you enter FANSPEED = AUTOMATIC the local EMU controls the blower
speed in each enclosure
Compaq recommends using the FANSPEED = AUTOMATIC command to enable the
EMU in each enclosure to implement corrective action whenever any one of the following
error conditions occurs:
•
A blower fails
•
You remove a blower
•
A blower is rotating too slowly to provide sufficient air flow
•
The ambient air temperature (EMU intake) exceeds the user defined temperature
•
Either backplane (exhaust) temperature exceeds the user-defined temperature